It's not ME that's lagging, it's the occasional other party. I have cable internet, and rarely have problems with lag. When I do, it's the other person.Lag is... lag. You just gotta deal with it. I can't say I've ever lost or won because of lag though. It just makes it annoying for everyone. And it's sad that I've not had a problem with anyone lying about a match except the top-ranked player. I still want my win, but the admins apparently don't want to give the top-ranked player a loss, even when shown picture proof that I won. Conspiracy!
A LAN adapter might not help, unfortunately. Wireless can provide 15-25 Mbps of throughput, and your Internet connection is either 1.5Mbps (DSL) or 6-8Mbps (Cable). Wired might give 100Mbps, but it's pointless when your Internet connection is what's slow. The only reason a wireless adapter can be bad is if you have interference in the area, which is certainly possible. Just don't count on it improving your experience by a lot.
If you're using DSL, upgrade to Cable. That can make the biggest difference.
You've had problems with Jumpan fudging scores too?